It's easy. If you see a person who has a lower level of English, then you already have something you can teach. If you also want to get paid for that, it's a completely different story.

If you want to be a school teacher and college professor so you have to complete some basic digree like you want to be a school teacher for class 6th to 8th so there is you have to do graduation + b.ed 2year digree + CTET exam it’s compulsory after this you should have excellence knowledge and confidence.. as well as good and attitude personality after that you can teach in reputed school in India ... and for class 9 to 12 plus the masters digree with those digrees.